ref_reg           547 kernel/bpf/hashtab.c 	const int ref_reg = BPF_REG_1;
ref_reg           553 kernel/bpf/hashtab.c 	*insn++ = BPF_LDX_MEM(BPF_B, ref_reg, ret,
ref_reg           556 kernel/bpf/hashtab.c 	*insn++ = BPF_JMP_IMM(BPF_JNE, ref_reg, 0, 1);